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FINANCIAL INSTRUMENTS (Details 2) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Fair Value Measurements |  |
Equity investment | $ 14,146 | $ 14,146
Investments, Contingent Purchase Obligation | 900 |
Realized Investment Gains (Losses) | 900 |
Level 2 |  |
Fair Value Measurements |  |
Cost | 277,079 | 317,722
Gross Unrealized Gains | 5 | 0
Gross Unrealized Losses | (285) | (454)
Fair Value | 276,799 | 317,268
Short-term: |  |
Fair Value Measurements |  |
Cost | 251,197 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (269) |
Short-term: | Level 2 |  |
Fair Value Measurements |  |
Cost |  | 257,456
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | (235)
Fair Value | 250,928 | 257,221
Short-term: | Asset-backed Securities |  |
Fair Value Measurements |  |
Cost | 34,873 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (33) |
Short-term: | Asset-backed Securities | Level 2 |  |
Fair Value Measurements |  |
Cost |  | 28,338
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | (37)
Fair Value | 34,840 | 28,301
Short-term: | Commercial Paper |  |
Fair Value Measurements |  |
Cost | 45,035 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (30) |
Short-term: | Commercial Paper | Level 2 |  |
Fair Value Measurements |  |
Cost |  | 48,999
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | (23)
Fair Value | 45,005 | 48,976
Short-term: | Corporate bonds |  |
Fair Value Measurements |  |
Cost | 171,289 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (206) |
Short-term: | Corporate bonds | Level 2 |  |
Fair Value Measurements |  |
Cost |  | 180,119
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | (175)
Fair Value | 171,083 | 179,944
Long-term: |  |
Fair Value Measurements |  |
Cost | 25,882 |
Gross Unrealized Gains | 5 |
Gross Unrealized Losses | (16) |
Long-term: | Level 2 |  |
Fair Value Measurements |  |
Cost |  | 60,266
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | (219)
Fair Value | 25,871 | 60,047
Long-term: | Asset-backed Securities |  |
Fair Value Measurements |  |
Cost | 9,383 | 23,836
Gross Unrealized Gains | 5 | 0
Gross Unrealized Losses | 0 | (79)
Long-term: | Asset-backed Securities | Level 2 |  |
Fair Value Measurements |  |
Fair Value | 9,388 | 23,757
Long-term: | Corporate bonds |  |
Fair Value Measurements |  |
Cost | 16,499 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (16) |
Long-term: | Corporate bonds | Level 2 |  |
Fair Value Measurements |  |
Cost |  | 36,430
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | (140)
Fair Value | $ 16,483 | $ 36,290

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